BI-195
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
The diagram (not shown) represents an enzyme with a specific active site. A student adds four different substrates to separate test‑tubes containing this enzyme. In which test‑tube will the reaction occur fastest?
- The substrate whose shape is exactly complementary to the active site.
- The largest substrate, even if it does not fit the active site.
- The substrate with the smallest size, regardless of shape.
- All substrates will react at the same rate with the enzyme.
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